Solve the system of equations by linear combination 4x+y=12 -8x+y=-12 what is the ordered pair. example: (x, y)

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

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Tiffany drives 285,120 feet before lunch and 628,320 feet after lunch. about how many kilometers does she drive all together